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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e28a66e8714c7dd8db22b2db27f83d8d243a83ef00e4cd969d7ed3aaba1a14' 
  AND token = 'awnLV02V5gjLONrxkUStNgWf2K94a5bpymnzPNS7wbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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