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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdfc3a5c07c7d6a7c6333e3eef6f8c7b1c7dbec849a9fcd7b79b4d492056794' 
  AND token = 'mj/wH9BbB3TUsWXxyXMtbyjnVuto0MbWTtChZDXY+DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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