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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2679f42c35b1284b6deee67318ee459f82ff07612e18790649b8045ff7dc5594' 
  AND token = 'RpjjSQEat6dcXedsn4g8DRkqeATI+Q090bpTUOIdX/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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