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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4de4bbfa7042b43c3b10c7bad6e5811dfe8c8f7837e7810042890978de6eb5' 
  AND token = 'ut1o7EVD7Yg2kOILtXvZk0k9uo5JA+KcC53kJg75rZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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