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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f006c6a1906335aee8a774d9cc9c0800ed30bfa924be285b2ef7ca33a86af0' 
  AND token = 'M626pEwK6lG2Uzq4QSHmt6nY7WY5nBvo+vVN4ohNU0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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