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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cf5c2093b453dd9c7f776b64c8293ec0da820be7fd815eb1bb69aadf982dbf' 
  AND token = '9AKn6FA7mmbb5x/mC1uUd2g4zQrMmwzVp9+oP2ZEU5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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