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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee1f878977d07d63c1211df2b8aaa71473e9e7080e0e5318317bccc29a77e79' 
  AND token = 'Qxc4IBaHyAmpAn/mXDewLwZTozh+ogbepvsL8TJpKu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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