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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29eb85e4f4f211ea4ac021cafb97e9c5796741d620a504789d63e4a328ef6d2c' 
  AND token = 'RFLgapfg2fB5csNIKC6xfCyVd2yX/tMQcVnpzeZ9qvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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