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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43e2333eeb70d38b5bd2846fecb6068b85612b6dd5030bf09167990ab5d7f3e' 
  AND token = 'qqsIhc5hOlVk3CwhS1OeXftenmWmkvgsqooQUkYH/QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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