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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e19ab97d09df96c2d600535b8a5861502b842f66ff7217465c92b99e1ac5ee0' 
  AND token = '+owpliQ69jhGfbXPUpla8yqGJPAdJmoa6J66i/fpNNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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