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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91660d84079f4ad62af55cc29b2555c17f90e6698831b4a8031f87828b68fe5b' 
  AND token = 'uUAWuxp0y/dt3ZRvcn6LBuKP5x3pkvyiEt5xN1SfbJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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