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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6984b897ffacf89523d321281707bd10d50508dd0f98b5447c03a48ff72061' 
  AND token = 'faHxvv7RBDIfZoo2c4VQd7fpTGvlyC5N3+W5aCk3SQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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