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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a831ca62e313a1218a5292d6d7a66e6df6eac931ad7039a8e283eed1782baf9' 
  AND token = 'b1VhASJtjlF1h5YLOuSUIAv5Jrcjnrv2gA64VWUaRIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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