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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9be0894e238d3759bfa792a35cca9019af87a8ae85efe7c401b0c2ab5736c8d' 
  AND token = 'HuF3wTSttA57Iop31DPK7Vy9gQqobjMgFf03bDz/9OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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