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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50452ef82dc3c87b10c082c98585a9af4ba0191e3a570c985f9ef4304e689d51' 
  AND token = 'INIl3uj0giHhnVCa1IjHfMS6DEMhPa3cBtq2WkR9hP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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