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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66fb096c3f9dd1937a31b6ef2cb856a079e3d54b0729e3b597caa36de641b16' 
  AND token = 'mzM6m2RPrMgCKGeLT3IVbhRihwIwao9IH4/WXge4xqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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