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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff720244a0fa1ec0abaaddb316ecc0cf408fed0f1dc83976b1db7df8e7c192f' 
  AND token = 'g1tK020b8WXkqv38PJr8DDD1B/G/l/k5iRHh7NLO9eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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