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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ab3401453e3b120b7ade9ba80e41d398f74bc62e118ad20c30d30f22bb44cb' 
  AND token = 'oHKjwsJPX0FKDPmwcoxA64Y5MybGOOrif5zPx1ZROR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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