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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ba9387a96005929ec88910ff0ce1c2c2426c898b570acfa94f942ddc5be5e9' 
  AND token = 'dvQeOi7PDown8WISICk9l4SelsnJrkJBfTbMrdlU7dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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