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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1b18e0e641a8847f9fb6663bba0b6cd19d969a2dc14239d15919cca905fc29' 
  AND token = 'zsLgyRu9osa/7t5T8nTCzxc9vStVsZoxlbICS9xl7xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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