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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8305a5d533185731934b2ea3f7c6190f32cfbe56660f5604fd9527049cec0df' 
  AND token = 'yPk42b6y+LSNScWYTsi9Lag7VHVbkfI51quY+NMuLwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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