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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef67aa9073f635426490738f08010a5a52258d90827f0a6565f4b60a6f5dea0' 
  AND token = 'VgDZnepGmqmmLZTYiq/3MJe2Ltzxj0mU0kZfEkd4v04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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