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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7228f56ebd8f5b59912279b4b3dcf5c43acb13d5de51be2138634cc54af6aba' 
  AND token = 'W4l31rSvJpVYSC6ErrnsOCh/x6lP9oOMriGfdNQiOYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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