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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e3c8cac487822f6a3e25d13108eb25de2b4a5cc7abfc277ab7588ae4c2f45e' 
  AND token = '7fVFVDqFyVM7qaV6qJj+1KCQskgeiLX0dL1EoU/+9OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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