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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4cbe4204360ace603be8f7aa7adb4c4afbb3c1332f3e02b0fbb11063a86dda' 
  AND token = 'Y9S7Irz3jFyuQ/ustKUuKdUH/RvzS7H6eaBdt2hI4PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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