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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20aa8089eae3add00fe19e1b8065cd4887a4b72b86ffa16343c28eb402adb25b' 
  AND token = 'csR0rew1Vp+JN3oTqXhub4Q5KSGLUxDXRcg+IefxgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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