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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07b10e05b21bceddd382a5e889835dbd0e9f66b9b21463f2dac18bd8fc7c640' 
  AND token = 'RDTL6Ir8gFh+DCozMFkov6sPxbYqIUMcc6o0KK/612I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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