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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca8aea528de4de83dc22f2a793b3951ebf5ea17e6736b52a4025f5d9e6785a2' 
  AND token = 'ArCsTzDF/ZoBKhp0b03FsZG7gUdYabBbXsigq6yG3I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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