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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e531691fa021046456a2e9199e5c3e7ab23d7739202094866e0f5fc1afa3dc' 
  AND token = 'qcjgiX7KcQlj4pq8bRum/msz7B/Yb35N/6Srm7dxLrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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