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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92dc44ee00c9867823f31c81158c8163be1db5fea2f895462cd8f0fcc1e575f' 
  AND token = 'ExDNFY8hOjPzA4CdgtIEIO0WXXxWHxxW8iRrcDCJcPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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