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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd939ee7740a47bbfa5427eca174b71c71da0b46fb6ae797e2dac6a8f2460fd2c' 
  AND token = 'wX+lI7nCQaAOfULfswYbcxNdo9JGKAo9UX41funmENQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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