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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2508a83043af1f1c68ddeedd4ba860e3c4309b72547dfd2d29587a77f6af34' 
  AND token = 'zF13M4hmGFU14Oc00CfW+mMASzJ8jQXoIx9f/vUL4iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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