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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b2b39b58cd69e38bd3c0289a44534514752be28a66f9edde2e14b489da9788' 
  AND token = '8rPyntFrDUQfCmtseKItCqlixOu8WrM7pLETjhpwKVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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