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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdb7fc9feef650ddab32cabaf90304d60681aeb92b9876c62a2bdd7d9e486ef' 
  AND token = 'MMvKX/S2/P5ejeFkp4e+9EH6USC9cj779qK/JlvzvRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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