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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad10d8d15e44dfe89e5289c9e91dd03a400ba00d9b45c8e2ebe77e95d85e21e1' 
  AND token = 'vPWBk3CCzCyVvCU/ZJ6u1BqV7obf544tUFkv5aCa92o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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