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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e7c7aaed0f994810f70689f4bb49a78b7ca4c6de0d36480a07a0cf16886ffc' 
  AND token = '7zzfVc6EswwcBAWuUJy43NKXo1YqV5K+jIIVrxo8bW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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