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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdc7151e19e584aabaa0e01f80dfdd5884ae6bb01e6fcdd836b61e0d5d83d6c' 
  AND token = 'LihFL1T3lV89OZx88rp9B8371oTE7zk5qNZMbif0noI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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