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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6f9bd786dc45a1ec4bb28947dca031ffc0dbbcae303e20a439116eaaaf3a88' 
  AND token = 'v6lvcue92MuF6LE5AwL+1cbB/jppMmcEWp2CAvHb7zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}