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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd364c5bcc32bc5fe7470c3efff35ff5c841dbe432b53e566a39153a04bbf0c7a' 
  AND token = 'B/iM8viEbi0jT1Nn66ZtLAqJaBAV8MEdSl7hR/lT/kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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