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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1717ce7724cc7edd9c80317cc42bde0791cf43636dd954b1c8cb7eeaee215ad' 
  AND token = '8feKKqhFtOZRydCz3Nhf1XgKVtKE12oo6Orz+b6U9x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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