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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670d2c2f721460251e1a1261cfe2381b10598a783ac4502973a5994cf9af96a8' 
  AND token = '9RMr4LksJtC/sq16MN0K77rPhOUaX/XiDUW7/aV8lWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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