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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec956e6df901bd57125bbdf0e08b9a4f2d84fae68c03f13fbda32bfcd4f7b67' 
  AND token = 'yxNyKHjGvMSY3uP6X5D+KSjzARPG/0d7CGf40O6siAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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