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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db84c5c5bcea8d635b56f346ae2b28f4565c301089ece317e0c1c4d27be8901' 
  AND token = 'I4hbg2Sp7c4p0Vb+yh2bI0oP+YgEkQivbltVlD7qryk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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