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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3ce5b06b763659dce6bbfe787790454856ffb543b975f801135660aca9b577' 
  AND token = 'cp5QegNa8h1JaP3cHBUIDyL8k9VXWsvT+4dwz5A5jEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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