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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6613aa0cd496c81f6846aacfd06f44c94fd8df6e307fe1391635b75424a319' 
  AND token = 'wDpdAepIised2nuj8805awwXOacSrih9xrxR1ik9P28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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