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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0ee31f93b83f674a0013b66991177c519f4185a527930f30a30bdf1ab8ff24' 
  AND token = 'XElYUjtdTNAd8eGM7WNg4E3sg7Xpw64tb1IWh0EFn+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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