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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731fe07c263beed1a2c453be3a734629d084f31bd0115fc5fc77a9b434e13bd8' 
  AND token = 'rFCI0iMcM2gUMoSJPjXO10/d1KygggGvoLWPrFgRJsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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