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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa9c4e6247b98bc17f32e625858e8a43a3d7c9aea343ca39660b3b0669315eb' 
  AND token = 'Lk+RTuyJVttPfdPAkQwG1cQxc91p5up/2UlJXTaWoEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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