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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9e432bee87fb18d71304d6abc666de69bbb851b041bf664734794ff5e7e3e6' 
  AND token = 'cYQil+4flfuE6qqv5LbAl/Y2GHVtvElyFLl94MXZPWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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