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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a323e8d73fda97c7ce85bc4b7b6daf94d9e2f6e9a9622133abf83aa416f02b21' 
  AND token = '9q1pBrwrCiGsNWG6I3+LzS6/QtlbSBIvaSaxk/k1U2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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