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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c8025995f5dabb258d0d25a94f9aedd37e4276d2336aaa7c55759ace75f3f0' 
  AND token = '8eagQ5zv6tG2CSWPacrZEB2xvZE8WoLhju/Kscx/i7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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