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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145cbdedfc59032dcdac36d1f76f92a8efa25a86bfb433a449ab129f3b6f8718' 
  AND token = '0aq5ciy4YnajDU9Jw1+kXqlzYVYdEIsADEc9fYE7hzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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