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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7addf2fcca8c8f8aa661398d3d73c3c070b60efd4bd6e19bba23f5183c5727a8' 
  AND token = '8A1GciVX60DdjxJGbkf8VFrH9r2zTeJWg3Agvzeqns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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