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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b220f2b82cf361ce749832bdd89a09d202372c9b0d9b94d5e76485c4a710fdfb' 
  AND token = '1ncs2VsGa5lHefn1A3C/QbtW3ELbWZ/plTim3aY1rrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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