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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5c49149d1d1fe52a4d4592a4a149a14dc8555dc6cbdbd13aefd3f3b74f8dd1' 
  AND token = 'xkVkw1q4tHHujPQQtq4Kc7aPIc4uf7Uxz7pBCcjhwOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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