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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd8acab468652afb8ee6b36ee6a61939e61eb97b64f7bf1f2727d5bbc54fbab' 
  AND token = 'rAosT1FusQGT1NsM9HNfXpBArfFnSU5kTE38hdzciHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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