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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c032ee7a5ff47717687ceb364429a754aec6ca9e935226cde7eb7d7c3271f5' 
  AND token = 'f7JlfgFWdEhncapL7xkUFHAY+wrCUYO3primrnIl0Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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