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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbe8f722669b18371424e9a7300d0a914a4865e1b4bee9c259e5f73293371f6' 
  AND token = 'CvYfEETKhIny2UXMaiRV/xprmwiNRI1Li6zPMxofLGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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