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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c57439c40c4b398f8dfa3b3fa6febcdac27bcb54552370831c78bdbcd2425c' 
  AND token = 'l114efKcfaaz1N1YF6b6nhI6HJWiuO/KVDpKEXF0ovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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