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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803060f64662d4ed58da7ea9e14587d63ab80bc7b5dd3e06ff7a89390fa8cde0' 
  AND token = '9UsyjZSYZicom2ZDP3L36s1dKw2bzU136oGdPGj6AMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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