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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0cc30d52f4ecfbfb6fe66891d61d47fb0046cff7a43d55da3dbf9d9a4f39ab' 
  AND token = 'IAJDnp6U6kHFolXoaMg7PrVn+Usy/axP90OcBrEnPfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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