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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6d2b48f4f2122321734f40fec78b01b170cc84d2ad2ec07281ae3d7a7dda97' 
  AND token = 'qPWaTiJGnOJZnjnHu+M1RyoowUo3ulFD7utix9KWZ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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