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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e2ba6f4da09eb863b1f4bd75671455639e87a9adb70223da58f10122c0455b' 
  AND token = 'i0xIbYYNyT6tol/QFbM7yX5k+048jdby/te/jVtrY0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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