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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb901efa90b1a76d10ed2de781f52e3681516276ddc5fb4115860555510d9833' 
  AND token = 'WHXbhWs6aAO9PYDErfQqIsCOZ9wnqpl0nJI/Axgw7CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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