SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0149ce401da8abc0bbbe5e02c8654398d6fc242b4413ec75542ff2228e9edd7' 
  AND token = 'qvYVw/jPMlO+lvfVtwh8N3Sus/02WLVGWICRwNvSAYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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