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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57135f9cc4230351d28a3393e021f195cdd74fb188d3eae84415ed53cfd0033a' 
  AND token = '4tScUB2tDSvqx+0tek+49JvXVkMsMAUDfJJ5QLe/63E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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