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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1134a35de9547bc6a3c4181938b5d392cb6209f1035d35703aa5f006dbb5116c' 
  AND token = 'Sp3CL8Aow/L2qvztk+a0uN2vAFXfShdhaE9edu7LWWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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