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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ad4f1f69cf972fb440cbc5f32982e5d31244368650004c847bd972b976e0df' 
  AND token = 'Qrt1c9akl+JU1cR2dYVVRQoF7f6HOFvGhOMh9hY9EEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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